Application of Sinusoidal Pulse-Width Modulation Control Scheme on Hybrid Switched-Capacitor Three-Phase Multilevel Inverter

Abstract

This paper presents the application of a sinusoidal pulse-width modulation (SPWM) control scheme on a hybrid switched capacitor three-phase multilevel inverter. The hybrid switched-capacitor configuration enables self-balancing across the capacitors without the need for complex control circuits, thereby minimizing hardware complexity. With the help of the switched-capacitor, the power circuit generated a double output voltage gain without a transformer. By employing SPWM, the inverter achieves a sinusoidal output with reduced total harmonic distortion (THD), improved voltage utilization, and enhanced dynamic response under variation of modulation index. Simulation studies using MATLAB software, utilizing components from the ‘Power Systems’ Simulink library, validate the effectiveness of the proposed system in delivering high-quality power suitable for renewable energy integration, electric drives, and grid-connected applications. At a modulation index of 0.9, the system yields a better harmonic content under a resistive load of 10 Ω. The results demonstrate that the combination of SPWM and hybrid switched-capacitor topology offers an efficient, cost-effective, lighter-weight, and reliable solution for modern high-performance power conversion systems.